JavaScript Quiz for Web Developers and Designers

Building large websites and using HTML5, CSS and JS? Then take some time out and spare just 5 minutes to attempt this JavaScript quiz. It includes 25 questions that would test your end to end knowledge of JavaScript.

JavaScript is the most famous, dynamic, and untyped client-side scripting language. While coding, you don’t require any type declaration for variables and methods. It supports both object-oriented and functional programming models and has built-in support for strings, arrays, dates and regular expressions.

With the help of JS and CSS, you can create responsive designs that improve the user experience and adds dynamic behavior like displaying pages without having to wait for the server.

In addition to the skills mentioned, building a remarkable web page also requires the knowledge of HTML5. So you may not want to miss out the below HTML5 quiz as well.

In this post, we are covering many JavaScript questions that will help a web developer to check his knowledge about the language features. And rest of the quiz contains coding snippets to evaluate your programming ability.

However, if you are a programming geek, then you can brainstorm further with more cool quizzes on Java/Python/Selenium and read related programming articles from our blog. Now, click to start the Javascript quiz.

JavaScript Quiz for Web Developers.

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Note – This JavaScript Quiz is for Web Developers and Designers, it includes 25 single choice questions. Please attempt each question and answer them carefully. Press the below Start quiz button to go ahead.

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Question 1 of 25

1. Question

10 points

What is the output of the following JavaScript snippet?

function() {
var a = 10;
if(a > 5) {
a = 7;
}
alert(a);
}

7

10

null

undefined

Correct

Incorrect

Question 2 of 25

2. Question

10 points

Which of the following is the output of the below JavaScript code?

function() {
if(true) {
var a = 5;
}
alert(a);
}

0

5

null

undefined

Correct

Incorrect

Question 3 of 25

3. Question

10 points

What is the result of the below JavaScript code when the functions get called in the order as mentioned?

8. Question

The typeof is a unary operator. It should occur before the single operand, which can be of any type.

Its value is a string indicating the data type of the operand.

Both of the above.

None

Correct

Incorrect

Question 9 of 25

9. Question

10 points

Is it valid to pass an anonymous function as an argument to another function?

true

false

Correct

Incorrect

Question 10 of 25

10. Question

10 points

Which of the following is a true statement for JavaScript callbacks?

A callback is a plain JavaScript function passed to some method as an argument or option.

Some callbacks are just events, called to give the user a chance to react when a certain state is triggered.

All except None.

None

Correct

Incorrect

Question 11 of 25

11. Question

10 points

Which of the following JavaScript code snippet would create an object?

function() {
var a = 10;
if(a > 5) {
a = 7;
}
alert(a);
}

var holder = Object();

var holder = new Object();

var holder = new OBJECT();

var holder = new holder();

Correct

Incorrect

Question 12 of 25

12. Question

10 points

Which of the following method of Boolean object returns a string depending upon the value of the object?

toSource()

valueOf()

toString()

None

Correct

Incorrect

Question 13 of 25

13. Question

10 points

Select a String function that finds the match between a regular expression and a string, and to replace the matched substring with a new substring?

concat()

match()

replace()

search()

Correct

Incorrect

Question 14 of 25

14. Question

10 points

Select a String function that creates a string and display in a big font as if it were in a tag?

anchor()

big()

blink()

italics()

Correct

Incorrect

Question 15 of 25

15. Question

10 points

Select a function of Array object which returns a new array comprised of the current array /or its value(s)?

concat()

pop()

push()

some()

Correct

Incorrect

Question 16 of 25

16. Question

10 points

What is the function of Array object that runs through each element of the array?

concat()

every()

filter()

forEach()

Correct

Incorrect

Question 17 of 25

17. Question

10 points

What is the function of Array object that adds and/or removes elements from an array?

toSource()

sort()

splice()

unshift()

Correct

Incorrect

Question 18 of 25

18. Question

10 points

Which of the following statements is valid for the features of JavaScript?

JavaScript is a lightweight, interpreted programming language.

JavaScript is designed for creating network-centric applications.

JavaScript is complementary to and integrated with Java.

All

Correct

Incorrect

Question 19 of 25

19. Question

10 points

Which of the following will return the type of the arguments passed to a function?

using typeof operator

using getType function

Both of the above.

None

Correct

Incorrect

Question 20 of 25

20. Question

10 points

Which of the following methods removes the last element from an array and returns that element?

last()

get()

pop()

None

Correct

Incorrect

Question 21 of 25

21. Question

10 points

Which of the following functions of Number object would display output in exponential format?

toExponential()

toFixed()

toPrecision()

toLocaleString()

Correct

Incorrect

Question 22 of 25

22. Question

10 points

Which of the following functions of Number object would return a string version of the number that may change according to the browser’s locale settings?

toExponential()

toFixed()

toLocaleString()

toString()

Correct

Incorrect

Question 23 of 25

23. Question

10 points

Which of the following function of String object would compare a regular expression with a string?

concat()

match()

search()

replace()

Correct

Incorrect

Question 24 of 25

24. Question

10 points

Which of the following function of String object returns the capitalized string while respecting the current locale?

toLocaleUpperCase()

toUpperCase()

toString()

substring()

Correct

Incorrect

Question 25 of 25

25. Question

10 points

Which of the following function of String object produces an HTML hypertext link for requesting another URL?

link()

sub()

sup()

small()

Correct

Incorrect

Note: You can review all the answers at the end of this quiz.

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